Contribution to a conference proceedings/Contribution to a book

FZJ-2025-00840

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Reducing the Sign Problem with simple Contour Deformation

Gäntgen, C. (Corresponding author)FZJ* ; Berkowitz, E.FZJ* ; Luu, T.FZJ* ; Ostmeyer, J. ; Rodekamp, M.FZJ*

2024
Sissa Medialab Trieste Trieste, Italy

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Please use a persistent id in citations: doi:10.22323/1.453.0007  doi:10.34734/FZJ-2025-00840

Abstract: We apply constant imaginary offsets to the path integral for a reduction of the sign problem in theHubbard model. These simple transformations enhance the quality of results from HMCcalculations without compromising the speed of the algorithm. This method enables us to efficientlycalculate systems that are otherwise inaccessible due to a severe sign problem. To support this claim,we present observables of the C20 and C60 fullerenes. Furthermore, we demonstrate that at a certainoffset, the sign problem is completely lifted in the limit of large chemical potential.

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)
2. Theorie der Starken Wechselwirkung (IAS-4)

Research Program(s):

1. 5111 - Domain-Specific Simulation & Data Life Cycle Labs (SDLs) and Research Groups (POF4-511) (POF4-511)
2. DFG project G:(GEPRIS)196253076 - TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik (196253076) (196253076)

Appears in the scientific report 2024

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